Reporter

The driver of a fully-loaded milk tanker was trapped in his cabin for over two hours after his truck crashed through a guard rail early on Monday morning, falling 20 metres down a steep gully north west of Sydney.

Paramedics were called to Putty Road, Putty, between Windsor and Singleton, about 4.55am, and they found the driver trapped in the wreckage, a NSW Ambulance spokesman said.

The man was cut from the truck about 7.30am.

"However, rescue crews are still on scene trying to rescue him from the gully," the spokeswoman said.

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Putty Road is closed in both directions and traffic is expected to be disrupted throughout the day.

The Transport Management Centre says traffic is extremely heavy and advises motorists to avoid the area.